In such cases, interesting indications can only come from macroscopic divergences,
seemingly beyond any reasonable uncertainty, as in the case of the famous polarization puzzle.
Even so, this puzzle persisted for so long exactly because of the
entangled treatment of experimental and theoretical ingredients,
which smeared the crucial (albeit a posteriori simple and predictable) evidence that
the current perturbative SDC calculations, at NLO, are definitely steeper, at low \(p_{\rm T}\) ,
than the corresponding experimental distributions.
This feature, rigorously studied in Ref. [1]}
by performing fits as a function of a selection cut progressively removing low-\(p_{\rm T}\)  data,
is immediately visible when the results of our data-driven fits are compared to calculations,
as done in Fig. REF .
As also illustrated by the LDME determination presented in Ref. [2]},
this method gives a better insight into the limitations of the current calculations,
allowing us to quantify the effects of the implied approximations.
